https://www.siliconvalley.com/2021/12/30/coronavirus-cdph-adopts-cdcs-shorter-recommended-times-for-isolation-quarantine/

SACRAMENTO – The California Department of Public Health on Thursday night announced it is updating its COVID-19 guidance to align with the U.S. Centers for Disease Control and Prevention’s new shorter recommended times for isolation and quarantine.

The guidance now calls for all individuals with COVID-19 to stay home for at least five days, down from 10. Isolation, the CDPH said, can end after day five if symptoms are not present or resolving and if an antigen test collected on day five or later is negative.